Displays active scene name in top left corner of the 'Scene' window, also highlights that scene in the 'Project' window, if pressed.

SceneNameDisplay.cs

#if UNITY_EDITOR

using UnityEditor;
using UnityEngine;
using UnityEditor.SceneManagement;

[InitializeOnLoad]
public class SceneNameDisplay
{
	[MenuItem("Tools/Scene name toggle &r")]
	private static void OpenPopupHierarchy()
	{
		EditorPrefs.SetBool("ShowSceneDisplay", !EditorPrefs.GetBool("ShowSceneDisplay"));
		SceneView.RepaintAll();
	}

	static SceneNameDisplay()
	{
		EditorPrefs.SetBool("ShowSceneDisplay", true);
		SceneView.duringSceneGui += OnScene;
	}
	
	static void OnScene(SceneView sceneView)
	{
		
		if(EditorPrefs.GetBool("ShowSceneDisplay"))
		{
			Handles.BeginGUI();
			GUILayout.BeginArea(new Rect(0, 0, 250, 20));
			Rect rect = EditorGUILayout.BeginVertical();
			GUI.color = new Color(1.0f, 1.0f, 1.0f, 0.5f);
			GUI.Box(rect, GUIContent.none);
			GUILayout.FlexibleSpace();
			if(GUILayout.Button(EditorSceneManager.GetActiveScene().name, GUIStyle.none))
			{
				EditorGUIUtility.PingObject(AssetDatabase.LoadAssetAtPath<SceneAsset>(EditorSceneManager.GetActiveScene().path).GetInstanceID());
			}
			GUILayout.FlexibleSpace();
			EditorGUILayout.EndVertical();
			GUILayout.EndArea();
			Handles.EndGUI();
		}
	}
}

#endif